The Manufacture is revisiting one of its most iconic models: the Traditionnelle chronographperpetual calendar. Equipped with the new Manufacture Vacheron Constantin Caliber 1142QP.

Caliber 1142 QP, a state-of-the-art movement entirely designed and developed within the Manufacture, replaces the previous 1141 QP. The new movement drives the perpetual calendar functions with indications of the date, days, months, leap years and moon phases as well as the chronograph functions with a direct-drive seconds hands and 30-minute counter at 3 o'clock, positioned opposite the small seconds at 9 o'clock. No need for adjustments until March 1st 2100.

The case, in platinum, measures 43mm x 12.9mm. It has double sapphire crystals and it is water resistant to 30 meters.

Movement is the Swiss manual-wind Vacheron in-house caliber 1142QP with 21 jewels, 21,600 vph and a power reserve of 48 hours. It is a Hallmark of Geneva certified timepiece. Functions are: hours, minutes, small seconds at 9 o'clock, perpetual calendar (day of the week, date, month, leap year indication), moonphase and column-wheel chronograph (30-minute counter) at 3 o'clock.

With the development of this new caliber, Vacheron has been keenly attentive to the energy constraints relating to the chronograph functions, in order to minimise their impact on the 48-hour power reserve. The oscillation frequency of the balance has also been raised from 2.5 to 3 Hz (21,600 vibrations/hour) so as to increase reliability and shock resistance.